I recently got a Dallmeyer f/6.5 Wide Angle lens, the 2.375" (~60mm) version. It came in a Size 0 Synchro-Compur shutter.

The lens mounting diameter, as manufactured, is 31mm for mounting in a flange.
This one had been machined down and re-cut to fit the Size 0 shutter. Due to the thinness of the remaining metal, some thread and length of the mount tube was lost, over at least part of the circumference.

I am just curious in case anyone is in a position to tell me what is the specified distance of the rear cell from the rear mounting face of the Dallmeyer assembly ? (I doubt if any loss is sufficient to cause significant optical degradation at the small stop apertures that I use.).

I will be mounting the lens on a Size 0 Epsilon shutter (re-built from 'parts' scraps), in which I have ground away an internal bevel, in the mounting tube, to minimise geometric vignetting by the shutter structure.
(This is copies the bevelling of the shutter used in my Envoy Wide Angle camera. That camera uses the optically-similar Taylor-Hobson Envoy Wide Angle f/6.5 64mm lens. The latter however is factory-manufactured to fit on the front of Size 0 shutters.)

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